2-4
IM 707231-01E
• Thermocouple/Voltage Measurement
Connects to the H and L terminals of channels 1-30 using a 2 wire system. Each H
and L terminal of channel 15C and 30C is a dedicated input terminal for resistance
temperature detector/resistance measurement. Don’t connect these when measuring
thermocouple/voltage.
• Resistance Temperature Detector/Resistance Measurement
Connect using a 4 wire system. When the measurement function is set to RTD
(resistance temperature detector) or OHM (resistance), measurement is performed on
the input signal voltages from the odd-numbered channels between CH1 and CH15, or
the even-numbered channels between CH16 and CH30. The next-numbered channel
becomes the current output terminal of the voltage measurement channel. For
example, if channel 1’s H and L terminals are the voltage input terminals, then channel
2’s H and L terminals are the current output terminals. The each H and L terminal of
channel 15 or 30 become current output terminals.
CH2’s H terminal
CH1’s H terminal
CH1’s L terminal
CH2’s L terminal
V
i
Mixing 2 and 4 Wire Systems
The terminals on the scanner box are divided into groups 1 and 2, and you can specify a
2 or 4 wire system for each group. Even for one channel, when you select measurement
with a 4 wire system (resistance temperature detector/resistance measurement), you can
only measure the odd-numbered channels from group 1 or even-numbered channels
from group 2. However you can mix 2 and 4 wire systems; for example if you measure a
resistance temperature detector or resistance with a 2 wire system on CH1, you can
have a 4 wire system such as the thermocouple or voltage on CH3.
Group 1: CH1-CH15, Group 2: CH16-CH30
2.2 Connecting the 30-CH Scanner Box and the Input Signal Wire
